Fig. 3-16: Analysis of low-resolution GABAB-G complex. (a) TM6 helix of a)GABAB does not expand outward. (b) Overlapping with TM of G protein, and comparing the direction change of G protein. (c) Comparing the structure of B1 state with that of B2A and B2B state, respectively, with TM bound to G protein as a reference, the two G proteins will have larger steric hindrance, which can explain the 2:1 relationship between GABAB and G protein.
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